First thing you should do, is see if the same thing happens with no scripts loaded.
If the problem doesn't show up, then keep trying it, using one script at a time until it reappears. NOTE: It'd be best to check each script one at a time (ie:load one, test it, if the problem doesn't occur, unload the script, load the 2nd, etc.)

If the problem reappears doing it like that, then the script that you just loaded is part (if not all) of the problem.
If it doesn't show up, then try loading various sets of scripts (ie:1 & 2, 1 & 3, 1 & 4, 2 & 3, 2 & 4, 3 & 4,...)

Just keep trying various combinations until the problem reappears.
Once the problem reappears, then we (should) have an idea as to which script(s) is/are causing the problem and we can review the script and see if it can be improved (odds are, if a script is causing that much usage, then it can be improved)